package springboot;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;


@SpringBootApplication
public class SpringbootApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
    }
    @Configuration
    public class JacksonConfig {

        @Bean
        @Primary
        @ConditionalOnMissingBean(ObjectMapper.class)
        public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder)
        {
            ObjectMapper objectMapper = builder.createXmlMapper(false).build();

            // 全局配置序列化返回 JSON 处理
            SimpleModule simpleModule = new SimpleModule();
            //JSON Long ==> String
            simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
            objectMapper.registerModule(simpleModule);
            return objectMapper;
        }
    }



}
